The design of a three-phase, 400-Hz, 15-kVA static inverter for motor-starting the 2- to 15-kWe Brayton electrical space power system is described. The inverter operates from a nominal 56-V dc source to provide a 28-V, rms, quasi-square-wave output. The inverter is capable of supplying a 200-A peak current. Integrated circuitry is used to generate the three-phase, 400-Hz reference signals. Performance data for a drive stage that improves switching speed and provides efficient operation over a range of output current and drive supply voltage are presented. A transformerless, transistor output stage is used.APPENDIX - COMPLETE INVERTER SCHEMATIC DIAGRAM AND PARTS LIST NATIONAL AERONAUTICS AND SPACE ... 100 V 0.005 mF, 1000 V CIO, Cll 8.2 iiF, 20 V C12 to C17 0.01 uF, 50 V C24 ten 660-(iF, 85-V tantalum capacitors in parallel C25 seven ... W R3 16 kfi, 0.25 W R4, R7 10 kfi, 0.25 W R5, R6 47 kfi, 0.25 W R8 100 kfi, 0.25 W R9 4.7 kfi, 0.25 W RIO 20 n, 25 W Rll 100 fi, 2 W R12 4.
|Title||:||Design of a three-phase, 15-kilovolt-ampere static inverter for motor-starting a Brayton space power system|
|Author||:||Robert J. Frye, Arthur G. Birchenough, United States. National Aeronautics and Space Administration, Lewis Research Center|